private void btnTermina_Click(object sender, EventArgs e) //btnTermina è il pulsante che deve far partire la stampa
        {
            dc.SubmitChanges(); //dc è il mio DataContext
            CreaScontrino();
            try
            {
                printDocument1.Print();                
            }
            catch (Exception ex)
            {
                MessageBox.Show("Impossibile stampare lo scontrino.\n\nDettagli:\n"+ex.Message, "Errore", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
            }
        }

        private void CreaScontrino()
        {
            PaperSize ps = new PaperSize();
            ps.PaperName = "Scontrino";
            ps.RawKind = (int)PaperKind.Custom;
            ps.Width = 224;
            ps.Height = 254; //provvisorio
            printDocument1.DefaultPageSettings.PaperSize = ps;
        }

        private void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
        {
            e.Graphics.PageUnit = GraphicsUnit.Millimeter;
            StringFormat sf = new StringFormat();
            sf.Alignment = StringAlignment.Center;
            Font grassetto = new Font(this.Font, FontStyle.Bold);
            SolidBrush brush = new SolidBrush(Color.Black);

            e.Graphics.DrawString("*** INTESTAZIONE ***", grassetto, brush,
                new RectangleF(e.MarginBounds.Left, e.MarginBounds.Top, e.MarginBounds.Right - e.MarginBounds.Left, 5), sf);
            
            e.HasMorePages = false;
        }